Tool path or G-code issues

Hi there, I'm running Vcarve Desktop and a 1500 x 1500 Workbee Z1.

My issue is that when i run a simple job like pocketing out a few letters i'm getting errors (please see screen shots of the job and errors)

After designing and then creating a tool path with what i believe is the correct router bit settings and then running the job the Workbee is doing odd things like completely missing a letter and not completing part of a letter.

When running a toolpath preview of the job it all looks good with no missing parts of letters.

If anyone has any advise i would br grateful.